[sdiy] Ensoniq ASR-X weirdness

[Sarah Thompson]

You could ring out the lines and look for the resistance to ground. If termination is on, it should be relatively low. If it's off, then it would be a few k ohms. Some kinds of active termination may fake out your meter, however.

Another option would be to hook everything up as normal and fire it up and look at the signal with a good low capacitance scope probe, active preferably, and see whether the edges are nice and square or whether they are ringing. Ideally you'd want to use a fairly fast scope, but SCSI is fairly slow by modern standards.

Sarah

> On Dec 1, 2015, at 8:36 AM, Travis Thatcher <recompas at gmail.com> wrote:
> 
> Thanks Dave,
> 
> I wonder if there's an issue with the termination...I think Iomega Zip
> drives are meant to work without mods with the ASR X however I'm
> curious if the internal termination of the ASR is malfunctioning. It
> is set to 'on' in the settings. Does anyone know how to actually
> electrically test termination on a scsi chain?
> 
>> On Mon, Nov 30, 2015 at 8:25 PM, Dave Brown <davebr at earthlink.net> wrote:
>> I don't know anything about ASR-X.  I have the EPS 16+.  What I do know on
>> this version the SCSI bus attenuation power has to come from the drive which
>> is very non-standard (in my experience).  I've yet to see a drive that
>> enables this easily so on my drives I have to modify them to provide it (the
>> drive provides the power to the EPS 16+ for termination in the synth).  I
>> don't know if the ASR-X does this or not but it might be worth checking on
>> the SCSI instructions.  Just a wild guess.
>> 
>> Dave
>> 
>>> -----Original Message-----
>>> From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of
>>> Travis Thatcher
>>> Sent: Monday, November 30, 2015 3:06 PM
>>> To: Synth DIY
>>> Subject: [sdiy] Ensoniq ASR-X weirdness
>>> 
>>> Not necessarily synth DIY so apologies but I'm stumped on this one. I have
>> an
>>> ASR-X (the black one) that won't format Zip disks. It starts to format and
>> then
>>> stops at 1.1% every time. I've tried 2 different zip drives and many
>> different
>>> brand new discs with the same results every time. Tried at least 2
>> different
>>> scsi cables as well. Has anyone else experienced this? I unfortunately
>> don't
>>> have access to a scsi hard drive or another device to test stuff with. Any
>>> suggestions would be greatly appreciated.
> 
> 
> 
> -- 
> http://www.travisthatcher.com
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